Datasheet.kr   

LT1117 데이터시트 PDF




Linear Technology에서 제조한 전자 부품 LT1117은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 LT1117 자료 제공

부품번호 LT1117 기능
기능 positive low dropout regulator
제조업체 Linear Technology
로고 Linear Technology 로고


LT1117 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




전체 16 페이지수

미리보기를 사용할 수 없습니다

LT1117 데이터시트, 핀배열, 회로
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
800mA Low Dropout
Positive Regulators Adjustable
and Fixed 2.85V, 3.3V, 5V
FEATURES
n Space Saving SOT-223 Surface Mount Package
n 3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
n Output Current of 800mA
n Operates Down to 1V Dropout
n Guaranteed Dropout Voltage at Multiple Current Levels
n 0.2% Line Regulation Max
n 0.4% Load Regulation Max
APPLICATIONS
n Active SCSI Terminators
n High Efficiency Linear Regulators
n Post Regulators for Switching Supplies
n Battery Chargers
n 5V to 3.3V Linear Regulators
L, LT, LTC, LTM, Linear Technology, OPTI-LOOP and the Linear logo are registered trademarks
of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
DESCRIPTION
The LT®1117 is a positive low dropout regulator designed
to provide up to 800mA of output current. The device is
available in an adjustable version and fixed output voltages
of 2.85V, 3.3V and 5V. The 2.85V version is designed
specifically to be used in Active Terminators for the SCSI
bus. All internal circuitry is designed to operate down to 1V
input to output differential. Dropout voltage is guaranteed
at a maximum of 1.2V at 800mA, decreasing at lower load
currents. On chip trimming adjusts the reference/output
voltage to within ± 1%. Current limit is also trimmed in
order to minimize the stress on both the regulator and the
power source circuitry under overload conditions.
The low profile surface mount SOT-223 package allows the
device to be used in applications where space is limited. The
LT1117 requires a minimum of 10μF of output capacitance
for stability. Output capacitors of this size or larger are
normally included in most regulator designs.
Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the quiescent current
of the LT1117 flows into the load, increasing efficiency.
TYPICAL APPLICATION
Active Terminator for SCSI-2 Bus
4.75V TO
5.25V
LT1117-2.85
IN OUT
+ GND
10μF
+
22μF
110Ω
110Ω
110Ω
110Ω
18 TO 27
LINES
1117 TA01
Dropout Voltage (VIN – VOUT)
1.4
–40°C ≤ TJ < 0°C
1.2
0°C ≤ TJ ≤ 125°C
1.0
TJ = 25°C
0.8
TJ = 125°C
0.6
0.4
0.2
0
0
INDICATES GUARANTEED TEST POINT
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
1117 TA02
1117fd
1




LT1117 pdf, 반도체, 판매, 대치품
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER
Quiescent Current
Thermal Regulation
Ripple Rejection
Adjust Pin Current
LT1117-2.85
LT1117-3.3
LT1117-5
CONDITIONS
VIN ≤ 10V
VIN ≤ 15V
VIN ≤ 15V
TA = 25°C, 30ms Pulse
fRIPPLE = 120Hz, (VIN – VOUT) = 3V, VRIPPLE = 1VP-P
MIN TYP MAX UNITS
l
5 10
mA
l
5 10
mA
l
5 10
mA
0.01 0.1
%/W
l 60
75
dB
l
55 120
μA
Adjust Pin Current Change
Temperature Stability
Long Term Stability
RMS Output Noise
Thermal Resistance
10mA ≤ IOUT ≤ 800mA, 1.4V ≤ (VIN – VOUT) ≤ 10V
TA = 125°C, 1000Hrs
(% of VOUT), 10Hz ≤ f ≤ 10kHz
(Junction-to-Case, at Tab)
l
0.2
0.5
0.3
0.003
15
5
μA
%
%
%
°C/W
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: See thermal regulation specification for changes in output voltage
due to heating effects. Load regulation and line regulation are measured at
a constant junction temperature by low duty cycle pulse testing.
Note 3: Dropout voltage is specified over the full output current range
of the device. Dropout voltage is defined as the minimum input/output
differential measured at the specified output current. Test points and limits
are also shown on the Dropout Voltage curve.
Note 4: Minimum load current is defined as the minimum output current
required to maintain regulation.
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Operating Current
(Adjustable Device)
4
3 TJ = 125°C
TJ = 25°C
2
TJ = –55°C
1
0
0 5 10 15 20
INPUT/OUTPUT DIFFERENTIAL (V)
1117 G01
Short-Circuit Current
1.25
TJ = 125°C
1.00
TJ = 25°C
0.75
0.50
0.25
0
0 5 10 15
INPUT/OUTPUT DIFFERENTIAL (V)
1117 G02
Load Regulation
0.10
ΔILOAD = 800mA
0.05
0
–0.05
–0.10
–0.15
–0.20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1117 G03
1117fd
4

4페이지










LT1117 전자부품, 판매, 대치품
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
APPLICATIONS INFORMATION
The LT1117 family of 3-terminal regulators are easy to
use. They are protected against short circuit and thermal
overloads. Thermal protection circuitry will shut down the
regulator should the junction temperature exceed 165°C
at the sense point. These regulators are pin compatible
with older 3-terminal adjustable regulators, offer lower
dropout voltage and more precise reference tolerance.
Reference stability over temperature is improved over
older types of regulators.
Stability
The LT1117 family of regulators requires an output
capacitor as part of the device frequency compensation.
A minimum of 10μF of tantalum or 50μF of aluminum
electrolytic is required. The ESR of the output capacitor
should be less than 0.5Ω. Surface mount tantalum
capacitors, which have very low ESR, are available from
several manufacturers.
When using the LT1117 adjustable device, the adjust
terminal can be bypassed to improve ripple rejection.
When the adjust terminal is bypassed, the required value
of the output capacitor increases. The device will require
an output capacitor of 22μF tantalum or 150μF aluminum
electrolytic when the adjust pin is bypassed.
Normally, capacitor values on the order of 100μF are
used in the output of many regulators to ensure good
load transient response with large load current changes.
Output capacitance can be increased without limit and
larger values of output capacitance further improve stability
and transient response.
Protection Diodes
In normal operation, the LT1117 family does not need any
protection diodes. Older adjustable regulators required
protection diodes between the adjust pin and the output
and between the output and input to prevent over stressing
the die. The internal current paths on the LT1117 adjust
pin are limited by internal resistors. Therefore, even with
capacitors on the adjust pin, no protection diode is needed
to ensure device safety under short-circuit conditions.
The adjust pin can be driven, on a transient basis, ± 25V with
respect to the output without any device degradation.
Diodes between input and output are not usually needed.
The internal diode between the output and input pins of
the device can withstand microsecond surge currents of
10A to 20A. Normal power supply cycling can not generate
currents of this magnitude. Only with extremely large output
capacitors, such as 1000μF and larger, and with the input
pin instantaneously shorted to ground can damage occur.
A crowbar circuit at the input of the LT1117 in combination
with a large output capacitor could generate currents large
enough to cause damage. In this case a diode from output
to input is recommended, as shown in Figure 1.
D1
1N4002
(OPTIONAL)
LT1117
VIN
IN OUT
ADJ
+
R1
VOUT
COUT
150μF
+ CADJ
10μF
R2
1117 F01
Figure 1
1117fd
7

7페이지


구       성 총 16 페이지수
다운로드[ LT1117.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
LT111

Voltage Comparator

Linear Technology
Linear Technology
LT1110

Micropower DC-DC Converter Adjustable and Fixed 5V/ 12V

Linear Technology
Linear Technology

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵